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Debt Obligations - Spectrum Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Nov. 09, 2024	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Nov. 30, 2023
Debt Instrument [Line Items]
Accrued interest and exit fees (current portion)		$ 64.3	$ 61.0
Spectrum | Senior Notes
Debt Instrument [Line Items]
Additional exit fee payable				$ 8.3
Exit fees (non-current portion)		15.9	15.9
Accrued interest and exit fees (current portion)		$ 22.4	$ 20.5
Exit fees	$ 2.0
Spectrum | Senior Notes | HC2 Broadcasting Holdings, Inc
Debt Instrument [Line Items]
Number of warrants outstanding (in shares)					145,825
Exercise price of warrants (in usd per share)					$ 0.01
Spectrum | Senior Notes | Weighted Average
Debt Instrument [Line Items]
Interest rate, effective percentage		22.90%	22.80%
8.50% Note due 2025 | Spectrum | Senior Notes
Debt Instrument [Line Items]
Interest rate		8.50%
11.45% Notes due 2025 | Spectrum | Senior Notes
Debt Instrument [Line Items]
Interest rate		11.45%

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